Driving mechanism for stokers



4 1,493,188 J. D. CAMPBELL l DRIVING MEGHANISM FOR sToKERs Filed Aug. 22. 1921 wir, /wM/f/m@ www Patented May 6, y1924.

UNITED STATES PATENT foFFlcE.

JOHN D. CAMPBELL, OF DETROIT, MICHIGAN, `ASSIGNOR TO DETROIT lSTOKEB. COH- PANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

DRIVING MECEANISM FOR STOXERS.

Application nea August 22, v1921. serial No. 494,056.

To all lwhom z't may concern.'

Be it known that I, JOHN D. CAMrBnm., a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan,have invented certain new and useful Improvements in Driving Mechanism for Stokers, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to stokers and particularly to that type in which a plunger is employed for forcing the fuel into the furnace. The object of the invention is to provide a simple construction of driving mechanism for the reciprocating plunger which includes a member adapted to shear o fl` if too great resistance is encountered by the plunger. With this as well as other objects in view, the invention resides inthe novel features of construction and combinations and arrangements of parts as more fully hereinafter set forth. v

In the drawings: Figure 1 is a diagrammatic sectional elevation of a construction embodying my invention; Figure 2 is a cross section on the line 2-2 of Figure 1;

Figure 3 is a perspective View of a detail. 1 is the ram case opening into the furnace 2 and having the hopper 3. 4 is the ram reciprocably mounted within the casing 1 and connected to the crank arm 5 by means of the connecting rod 6. this crank arm being rotatable with the large worm wheel 7 which is driven from the large worm 8 upon the shaft 9. 10 is a small worm wheel upon the shaft 9 meshing with the small worm` 11 upon the shaft 12. 13 is a driving shaft and 14 and 15 are sprocket wheels respectively mounted upon the shafts 13 and 12 and over which pass'the sprocket chain 16.

For the purpose of preventing the parts being damaged in the event that the ram 4 encounters abnormal resistance in its movements, I have provided the following construction which is sufficiently strong to operate the ram under ordinary conditions but which will give when the ram encounters abnormal resistance so that the'driving shaft may Vcontinue to rotate without damaging the driving mechanism: 17 is a driven member having a hub 18 keyed to the shaft 12 and also having the transverse end flange 19.' 20 is a cooperating driving member rotatably mounted upon the hub 18 and having an annular reduced portion 18 to which the sprocket wheel 15 is keyed. The driving member also has a transverse end flan e 21 corresponding to the transverse end ange 19 and lying adjacent thereto. 21 is a collar that is detachably secured to the hub 18 for retaining the member 20 in engagement with the flange 19 and for retaining the sprocket wheel 15 against a shoulder 15 formed by the reduced portion 18 of the sleeve 20. 22 i`s a pin extending through the transverse end flanges 19 and 21 for rotating the former from the latter, this'pin being of sufficient strength to normally reciprocate the ram 4 through the intermediate driving connections, but being designed to shear before any part of the other driving connections is damaged when abnormal resistance is encountered.

For the purpose of more readily withstanding any wear and at the same time to secure a shearing off of the pin, there are the hardened `cylindrical bushings 23 and 24 surrounding the pin 22 and insertable within the transverse end flanges 19 and 21 respectively. For securing the pin in place, the same has the transversely bent end 25 which is adapted to be engaged by the resilient clip 26 secured upon the transverse end flange 19.

What I claim as my invention is:

l. In a driving mechanism, the combina tion with a driven shaft, of a driven member having a hub non-rotatively secured to said shaft, a flange upon said hub` a sleeve rotatively mounted upon said hub and engaging saidflange, a member secured to said hub and retaining said sleeve in engagement with said flange, a flange upon said sleeve adjacent to the flange aforesaid, said flanges having openings therein, and a shearable pin extending through the openings in said flanges.

2. In a driving mechanism, the combination with a driven shaft. of a driven member having a hub non-rotatively secured to said shaft, a flange upon said hub, a collar secured to said hub, a sleeve rotatively mounted on said hub between saidflange and collar, a shoulder on the sleeve, a wheel nonrotatively mounted on said sleeve between said shoulder and collar, a flange upon said yloo sleeve adjacent to the'ange aforesaid, and

a shearable driving connection between the lfanges on said sleeve and the flange 0n said 6 3. In a drivingl mechanism, the combination with a driven shaft, of a driven member having a hub non-rotatively secured to said shaft, a flange upon said hub, a sleeve rotatably mounted on said hub and engag l0 ing said flange, a shoulder on said sleeve, a.

memes wheel non-i'otatively mounted on said sleeve and engaging said shoulder, a single member on said hub retaining said wheel in engagement with said shoulder and retaining said sleeve in engagement with said flange, a. flange on said sleeve, and a driving` connection between the anges on said sleeve and the ange on said hub. K

In testimony whereof I aiix m signature.

- J OHN D. CA PBELL. 

